1. Config LEDE/OpenWRT with
- CONFIG_PACKAGE_perf=y
- CONFIG_KERNEL_PERF_EVENTS=y
2. Add dynamic probe with external modules
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$ perf probe –a –m /lib/modules/4.9.109/ath9k.ko ‘ath_tx*’ $ perf probe –a –m /lib/modules/4.9.109/ath9k.ko ‘ath9k_wake_tx_queue’ $ perf probe –a –m /lib/modules/4.9.109/mac80211.ko ‘fq_*’ $ perf probe –a –m /lib/modules/4.9.109/mac80211.ko ‘ieee80211_tx*’ |
3. Perf Recording
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# Sample CPU stack traces, only with “probe:” events, by ping, with timestamp $ perf record –agT –e ‘probe:*’ ping 192.168.1.150 > /dev/null |
4. Perf Reporting
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# Show perf.data in an ncurses browser (TUI) if possible: $ perf report # Show perf.data by function graph: $ perf report –g # List all events from perf.data: perf script # List all perf.data events, with customized fields (>= Linux 4.1): perf script –F time,event,trace |
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